Reaally impressive for a first time dev and especially for only a week of work! It was very cute and made me chuckle when I was a tiny little guy who could jump to the skies. Charming sounds and art too.
I felt like I maxed out some of the upgrades/nerfs but was not sure since there was no indicator that showed me this. Also when I reached the area where I had to be bigger to press a button I could not get big enough with the power ups there and I could not go back even though my jump was maxed out, which resulted in me having to restart from the beginning. So a tip from me is to avoid these types of areas where it is impossible to progress without having to restart :)
Otherwise great job and good luck in the game jam!